VBO c# tao framework
Author
At first sorry for my english :)
I tried to write program, where I use the VBO.
I've got:
public void SetData()
{
state_ = true;
vertex_ = new float[12];
texture_ = new float[8];
vertex_[0] = -5f; vertex_[1] = 0f; vertex_[2] = 0f;
vertex_[3] = 5f; vertex_[4] = 0f; vertex_[5] = 0f;
vertex_[6] = 5f; vertex_[7] = 5f; vertex_[8] = 0f;
vertex_[9] = -5f; vertex_[10] = 5f; vertex_[11] = 0f;
texture_[0] = 0f; texture_[1] = 0f;
texture_[2] = 1f; texture_[3] = 0f;
texture_[4] = 1f; texture_[5] = 1f;
texture_[6] = 0f; texture_[7] = 1f;
Gl.ReloadFunctions();
id = new int[1];
Gl.glGenBuffersARB(1, id);
Gl.glBindBufferARB(Gl.GL_ARRAY_BUFFER_ARB, id[0]);
Gl.glBufferDataARB(Gl.GL_ARRAY_BUFFER_ARB, (IntPtr)(12 * sizeof(float)), vertex_, Gl.GL_STATIC_DRAW_ARB);
id1 = new int[1];
Gl.glGenBuffersARB(1, id1);
Gl.glBindBufferARB(Gl.GL_ARRAY_BUFFER_ARB, id1[0]);
Gl.glBufferDataARB(Gl.GL_ARRAY_BUFFER_ARB, (IntPtr)(8 * sizeof(float)), texture_, Gl.GL_STATIC_DRAW_ARB);
vertex_ = null;
texture_ = null;
}
and function:
internal void Redraw()
{
Gl.glMatrixMode(Gl.GL_PROJECTION);
Gl.glLoadIdentity();
Gl.glOrtho(-10.0f, 10.0f, -10.0f, 10.0f, -1.0f, 1.0f);
Gl.glMatrixMode(Gl.GL_MODELVIEW);
Gl.glLoadIdentity();
Gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
Gl.glClear(Gl.GL_COLOR_BUFFER_BIT | Gl.GL_DEPTH_BUFFER_BIT);
if (state_)
{
Gl.glBindTexture(Gl.GL_TEXTURE_2D, t_);
Gl.glTexEnvi(Gl.GL_TEXTURE_ENV, Gl.GL_TEXTURE_ENV_MODE, Gl.GL_MODULATE);
Gl.glEnable(Gl.GL_TEXTURE_2D);
Gl.glBindBufferARB(Gl.GL_ARRAY_BUFFER_ARB, id[0]);
Gl.glBindBufferARB(Gl.GL_ARRAY_BUFFER_ARB, id1[0]);
Gl.glEnableClientState(Gl.GL_VERTEX_ARRAY);
Gl.glEnableClientState(Gl.GL_TEXTURE_COORD_ARRAY);
Gl.glVertexPointer(3, Gl.GL_FLOAT, 0, 0);
Gl.glTexCoordPointer(2, Gl.GL_FLOAT, 0, 0);
Gl.glDrawArrays(Gl.GL_QUADS, 0, 4);
Gl.glBindBufferARB(Gl.GL_ARRAY_BUFFER_ARB, 0);
Gl.glDisableClientState(Gl.GL_VERTEX_ARRAY);
Gl.glDisableClientState(Gl.GL_TEXTURE_COORD_ARRAY);
Gl.glDisable(Gl.GL_TEXTURE_2D);
}
Gl.glFlush();
}
and after function Redraw I call this.simpleOpenGlControl1.SwapBuffers();
And I've got black screen. Why? Any idea what I'm doing wrong? That is my first program where I use VBO.
I use c# and tao framework to write this program.
Your operations are out of order.
Instead of this:
You need this:
glPointer generates a pointer into the currently bound ARRAY_BUFFER, so when you call glVertexPointer, your vertex buffer must be bound.
In your code opengl is reading its vertices from your texture coordinates buffer, which obviously won't work.
[Edited by - karwosts on April 1, 2010 5:50:16 PM]
Instead of this:
Gl.glBindBufferARB(Gl.GL_ARRAY_BUFFER_ARB, id[0]);Gl.glBindBufferARB(Gl.GL_ARRAY_BUFFER_ARB, id1[0]);Gl.glVertexPointer(3, Gl.GL_FLOAT, 0, 0);Gl.glTexCoordPointer(2, Gl.GL_FLOAT, 0, 0);You need this:
Gl.glBindBufferARB(Gl.GL_ARRAY_BUFFER_ARB, id[0]);Gl.glVertexPointer(3, Gl.GL_FLOAT, 0, 0);Gl.glBindBufferARB(Gl.GL_ARRAY_BUFFER_ARB, id1[0]);Gl.glTexCoordPointer(2, Gl.GL_FLOAT, 0, 0);glPointer generates a pointer into the currently bound ARRAY_BUFFER, so when you call glVertexPointer, your vertex buffer must be bound.
In your code opengl is reading its vertices from your texture coordinates buffer, which obviously won't work.
[Edited by - karwosts on April 1, 2010 5:50:16 PM]
Gl.glVertexPointer(3, Gl.GL_FLOAT, 0, 0);Gl.glTexCoordPointer(2, Gl.GL_FLOAT, 0, 0);Additionally, you need to change the last paramatere from 0 to IntPtr.Zero, otherwise Tao will crash hard.
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